JOINT ZONE EVOLUTION IN INFRARED BRAZED Ti-6Al-4V WITH COPPER THIN FILM

 
 
 
 

JOINT ZONE EVOLUTION IN INFRARED BRAZED Ti-6Al-4V WITH COPPER THIN FILM

Show full item record


Title: JOINT ZONE EVOLUTION IN INFRARED BRAZED Ti-6Al-4V WITH COPPER THIN FILM
Author: LI, JR-HUNG
Description: Joining of Ti-6Al-4V with thin film copper fillers was developed using an active infrared processing technique. The process includes rapid infrared heating of the specimen to 1125 degree C, and holding at that temperature for 60 seconds in flowing argon without vacuum, then followed by rapid cooling. The copper thin film filler was electroplated to various thicknesses: 1, 2, 4 and 8 micrometer. Excellent wetting between copper and Ti-6Al-4V was observed in all joints. High joint shear strengths were obtained for all joints. The highest joint strength, 616¡Ó10 MPa, was obtained with 2 micrometer filler thickness. This joint strength is significantly higher than the shear strength of pure copper, 174 MPa, or Ti-6Al-4V, 542 MPa. When the filler material was only 1 micrometer, the joint zone was not completely filled. X-ray diffraction analysis on the as fractured joint surface revealed the presence of intermetallic compounds when joined with 4 and 8 micrometer copper fillers but it disappeared when joined with 1 and 2 micrometer copper fillers. Compositions of the joining zone and the base materials near the joining zone were determined with an energy dispersive spectroscope (EDS) and electron microprobe analysis (EMPA) equipped on the SEM. Also, specimen were joined with 25 ƒÝm Cu at 1125 degree C with various holding time of 0, 60, 120, 180, 240, and 300 seconds to observe the joint zone evolution. The joint evolution follows by melting of Cu filler, dissolution of base materials into Cu liquid, saturation of Cu liquid and isothermal solidification of liquid phase.
Permanent Link: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109186764
http://hdl.handle.net/2374.OX/12309
Date: 2005

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show full item record